Drawing instrument.



J. A. LANIGA'N, JR.

DRAWING INSTRUMENT.

APPLICATION map um. 31, me.

Patented Apr; 30, 1918.

IHNVENTOR I ciiknflLan/gyamfr WITNESSES ATTORN EY JOHN A. LANIGAN, ([3,, OF BROOKLYN,'NEW YORK,

DRAWING INSTRUMENT.

Application filed October 31, 1916. Serial No. 128,774.

To all whom it may concern:

Be it known that I, JOHN A. LANIGAN, J11, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful. Improvements in Drawing instruments, of which the following a specification.

My invention relatesto .new and useful improvements in drawing instruments and more particularly to compasses and dividers.

The primary object of'the invention is the provision of a device of this character which is simple and inexpensive in construction and which may be readily adjusted.

A further object of the invention is the provision of means for the adjusting of the several parts and for holding them in their adjusted position.

A still further object of the invention is the provision of means for indicating the degree to which the sewn-a] parts are adjusted. I

Another object is the provision of means for firmly gripping the instrument for turning.

With these and otherobjects in view, the invention consists in the novel details of construction and arrangement of parts which will be more clearly understood from the following description and drawing, in which,

Figure 1 is a side view with parts broken away to show the slot in one leg, j

Fig. 2. is a side view partly in section.

My improved divider or compass comprises the legs 1 and 2 hingedly connected together, as indicated at 3, preferably by a spring-hinge. The leg 1 is hollow, as more particularly illustrated in Fig. 2 of the drawing, and in the lower end thereof is adapted to be inserted a metal casting or point 4 of the construction shown. The leg 2 is provided with the elongated slot 2 in one face thereof, the purpose of which will be presently described, and is provided in the lower end with a socket for receiving a lead or other point 5 for marking purposes, and said point may be held in position in any desired manner. A flange 1 is formed 1 on the leg 1 adjacent the upper end thereof and forms a hand-hold for turning the instrument.

Longitudinal openings 6 and 7 are formed in the leg 1, the purpose of which will be presently described. A threaded rod 8 is mounted in the hollow leg 1 and is formed on the lower end with a reduced extension whichfits in a socket formed in a washer or plate which engages the casting or point 4. I do not wish to limit myself to this particular form of washer orplate, but it will be understood that the socket might equally as well be formed directly in the casting l. An enlargement or knob 11 is formed on the threaded rod, or secured thereto in any desired manner and is of a diameter equal to that of the leg 1 and rests upon or en: gages theupper end of said leg. This enlargement or knob- 11 is used for turning the threaded rod 8 for the purpose as willbe presently described.

A block or casting 12 is slidably mounted within the leg 1 and is providedwith a threaded central opening to receive the threaded rod 8. This block or casting 12 has an extension which passes throughthe longitudinal opening 7 in the leg and a bar 13 is hingedly connected to this extension at 14: and the opposite end is hingedly connected at the lower end of the slot 2, in the leg 2, as indicated at'15. V The bar 13 is adapted 'to be received within the slot 2 when the legs are closed. If desired, the hinges 1 1 and 15 may be spring-hinges.

The leg 1 is provided with scales or graduations 16 on oneside ofthe longitudinal Slot 6 and a pointer or indicator 17 is connected to the block or. casting 12 and extends through the slot 6. This pointer or indicator 17 cooperates with the scale or graduations 16 for indicating the degree to which the divider or compass is adjusted.

Having fully described the details of construction it is thought that the advantages and operation of my device will be clearly understood. The casting or point 4 on the lower end of the leg 1 will act as a center pivot and the lead or other marking device on the leg 2 will mark the desired lines. The leg 2 is adjusted in relation to the leg 1 by rotating the threaded rod 8 by means of the enlargement or knob 11. The rotation of the threaded rod 8 raises and lowers the block or casting 12 which in turn raises and lowers the brace 13, thereby adjusting the leg to a greater or less distance with relation to the leg 1. The pointer or indicator 17 operat ing with the graduations 16 will indicate the degree to which the legs are adjusted. As previously stated, when the legs are closed the bar 13 will lie within the slot 2 in the leg 2. The flange 1 at the top of the leg 1 provides a grip for turning the instrument.

After the legs have been adjusted to the desired degree they may be quickly opened or closed by merely pulling upon the enlargement or knob 11 thereby sliding the threaded rod 8 in the leg 1 and drawing the block or casting 12 therewith.

Having fully described the invention, n I' e'laim as new and desire to secure by Lett'ersPatent is i i l; A draifi n u e t comp i ng hi er edly "connected legs, a threaded rod rotatably mounted in one of the legs, a block carried by said threaded rod, and a brace hii'igedly connected to said block at one end and to the oopos ite at the other end.

2. A drawlng'instrument comprising hingedly connected legs, one of said legs beinghollow, a threaded rod rotatably mounts ed inthe hollow leg, 3, block carried by said threaded rod, means carried by'said block and connected to the other leg for adjusting 'tlctie legs, and means for rotating the threade r0 31A drawing instrument comprising hingedl'y eo ne ed es n Q fs'ai l e ing hollow and provided with a longitudinal slot thereima threaded rod rotatably mounted in said hollow leg,'a block carried by said threaded rod, means connected to the block for adjusting the legs and a pointer connected tosaid block and to the other leg and extending through the longitudinal slot.

A ra ng inst ument c mp i ng hi edly "connec ed gs, One f S i eg eing hollow and provided Wi h, two l g udially exte ding open ngs, a thr a ed r ret eb y nd lideb 'y un ed in a holleW le ya b oek' earned by said od, an

tension on the block extending through one of the longltudinal openings, a bar connected to said extension on the block and to the other leg for adjusting the legs, a pointer connected to said block and extending through the other longitudinal opening, and means for rotating the threaded rod.

5. A drawing instrun'lent comprising hingedly connecting legs, one of said legs being hollow, a threaded rod rotatably mounted in said hollow leg, an enlargement on said threaded rod adapted to engage the end of the hollow leg and of equal diameter therewith, and means carried by the threaded rod and the other leg for :uljusting the legs.

6. A drawing instrument comprising hingedly connected legs, on of said legs ha\-- ing a slot therein, and a brace hingedly connected to the legs and adapted to be received in the slot.

7 A drawing instrument comprising hingedly connected legs, one of said legs having a slot therein, and a brace, one end of said brace being hinged within the slot, and the opposite end hinged to the other leg.

8. A drawing instrument comprising eonneeted legs, one of said legs being hollow, a member within said hollow leg, means for rotating Said member, a movable member mounted upon said first-mentioned member and adapted to travel toward the opposite ends thereof, and means connecting said movable member with the reu'laining leg.

In testimony whereof I allix my signature in presence of two witnesses.

JOHN A. LANIGAN, JR. Witnesses:

MARY LANIGAN, WILLARD F. ROGERS.

live cents each, by addressing the (Commissioner of Patents, W shin Q 

